EP3421148B1 - Reinigen eines walzguts beim kaltwalzen des walzguts - Google Patents

Reinigen eines walzguts beim kaltwalzen des walzguts Download PDF

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Publication number
EP3421148B1
EP3421148B1 EP17178803.7A EP17178803A EP3421148B1 EP 3421148 B1 EP3421148 B1 EP 3421148B1 EP 17178803 A EP17178803 A EP 17178803A EP 3421148 B1 EP3421148 B1 EP 3421148B1
Authority
EP
European Patent Office
Prior art keywords
rolling
rolling stock
stock
cleaning
emulsion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP17178803.7A
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German (de)
English (en)
French (fr)
Other versions
EP3421148A1 (de
Inventor
Martin Bergmann
Konrad Krimpelstätter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Primetals Technologies Austria GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Primetals Technologies Austria GmbH filed Critical Primetals Technologies Austria GmbH
Priority to EP17178803.7A priority Critical patent/EP3421148B1/de
Priority to US16/619,284 priority patent/US11554396B2/en
Priority to PCT/EP2018/065449 priority patent/WO2019001945A1/de
Priority to CN201880043593.6A priority patent/CN110809497A/zh
Priority to JP2019572081A priority patent/JP2020525297A/ja
Publication of EP3421148A1 publication Critical patent/EP3421148A1/de
Application granted granted Critical
Publication of EP3421148B1 publication Critical patent/EP3421148B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269—Cleaning
    • B21B45/0275—Cleaning devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling

Definitions

  • the invention relates to a method for cleaning a rolling stock during cold rolling of the rolling stock.
  • the rolled stock which is generally in the form of a strip-shaped rolled strip, is generally deformed several times, with the thickness of the rolled stock being reduced with each deformation.
  • the forming is carried out, for example, in a so-called tandem train, through which the rolling stock is moved in one direction of passage and which has a plurality of rolling stands arranged one behind the other along the direction of passage, with each of which a forming is carried out.
  • the rolling stock is moved through the same roll stand in a number of rolling passes alternately in opposite directions through so-called reversing rolling, with the rolling stock being deformed in each rolling pass.
  • a roll stand generally has two work rolls arranged one above the other, which are spaced apart from one another by a roll gap through which the rolling stock is passed.
  • a rolling emulsion is usually applied to the rolling stock and/or to the work rolls.
  • a rolling emulsion usually contains water, rolling oil and an emulsifier to make the rolling oil miscible with the water.
  • a rolling emulsion can contain other components, for example at least one antioxidant, an anti-wear additive and/or an anti-corrosion additive.
  • DD 282 632 A5 discloses a device for cleaning cold-rolled strip after leaving the roll gap in the form of a holding plate on which V-shaped mechanical scrapers are mounted and which also includes bores for applying cleaning agent to the surface of the rolling stock.
  • a mechanical scraping device is naturally subject to wear and tear. In addition, hard particles that accidentally entered the scraper device can scratch the surface of the rolling stock.
  • DE 30 28 285 A1 discloses a method of cleaning metal strip during cold rolling, in which a cleaning solution is sprayed onto the top and bottom surfaces of the metal strip immediately before and after final rolling. If the rolling stock is cleaned before and after the last rolling, metal particles that were already firmly rolled into the rolling stock surface before the last rolling can either not be removed from the rolling stock surface at all or only with great effort.
  • the JP S56 169781A shows a method for cleaning a rolling stock during cold rolling of the rolling stock in a tandem train having several rolling stands, wherein - the rolling stock is moved through the tandem train in a direction of passage and - between two rolling stands water as a cleaning liquid is sprayed in a direction at a pressure of approximately 98 bar onto the Rolled stock is sprayed.
  • the invention is based on the object of specifying an improved method for cleaning a rolling stock during cold rolling of the rolling stock.
  • a first embodiment of the method according to the invention relates to the cleaning of a rolling stock during cold rolling of the rolling stock in a tandem train having a plurality of roll stands.
  • the rolling stock is moved through the tandem train in a direction of passage and between the first and second roll stands and/or between the second and third roll stands of the tandem train, a cleaning liquid is sprayed at a pressure between 6 bar and 100 bar in a spray direction which is one of the Has the opposite component in the direction of passage, sprayed onto the rolling stock, a rolling emulsion or an emulsion similar to the rolling emulsion or water being used as the cleaning liquid.
  • the first roll stand of a tandem train is understood to mean the roll stand of the tandem train through which the rolling stock travels first.
  • the second or third roll stand of a tandem train is understood to mean the second or third roll stand of the tandem train through which the rolling stock has passed.
  • the same rolling emulsion can be used as a cleaning fluid that is also used to reduce the friction between the rolling stock and the rolls of the roll stands of the tandem train or the rolls of the roll stand used for reversing rolling.
  • the piping of an existing emulsion system of the cold rolling mill can also be used, at least in part, for cleaning the rolling stock, which reduces the amount of piping required.
  • water is used as the cleaning liquid. Using water reduces over using more specific ones Cleaning fluids the cost of cleaning the rolling stock.
  • This embodiment enables the rolling stock to be cleaned between two roll stands of a tandem train. As a result, contamination of the rolling stock can be removed after it has passed through a rolling stand, before the rolling stock enters the following rolling stand. This prevents metal particles abraded when passing through a rolling stand from being rolled into the rolling stock surface by the following rolling stand, since they are already removed from the rolling stock before the rolling stock enters the following rolling stand.
  • Cleaning the rolling stock by spraying the rolling stock with a cleaning liquid has the advantage over mechanical scraping of metal particles and rolling emulsion residues from the rolling stock that contact of the cleaning device with the rolling stock and thus mechanical wear of the cleaning device through its contact with the rolling stock is avoided.
  • the metal particles to be removed have sizes in the range of a few ⁇ m and are only removed by the mechanical action of the cleaning spray jet; an increased temperature of the cleaning liquid is therefore not necessary, so that heating and the associated energy requirement, in contrast to conventional strip cleaning systems, which start behind the tandem train, are advantageously eliminated.
  • Spraying the rolling stock in a spraying direction that has a component opposite to the direction of passage advantageously increases the cleaning effect of the spraying by a component of the spraying direction that is opposite to the movement of the metal particles and rolling emulsion residues.
  • the aforementioned configuration of the first embodiment of the method takes into account that in a tandem train, the largest proportion of the metallic abrasion occurs in the first two Rolling stands of the tandem mill arises because the rolling stock entering the tandem mill has a high surface roughness and is still relatively soft and thick compared to its condition when it passed through the rear rolling mill stands.
  • the surface roughness of the rolled stock decreases with each roll, while the surface hardness of the rolled stock increases with each roll.
  • the metallic abrasion also decreases with each roll.
  • Relatively large amounts of rolling emulsion are used in cold rolling, for example about 6000 l/min per roll stand.
  • This typically creates a liquid lake of rolling emulsion with a depth of a few millimeters on the upper side of the rolling stock, through which the cleaning liquid has to penetrate in order to loosen the metal particles and rolling emulsion residues from the rolling stock.
  • the cleaning fluid typically has to be sprayed onto the rolling stock at a pressure of between 6 bar and 100 bar.
  • a further embodiment of the invention provides that the spraying direction has a component which is directed towards an edge area of the rolling stock.
  • the metal particles and rolling emulsion residues are moved by the cleaning liquid sprayed onto the rolling stock to an edge region of the rolling stock and can thus be removed from the rolling stock.
  • a further embodiment of the invention provides that the spray direction varies depending on a spray location sprayed with cleaning liquid along a width of the rolling stock transverse to the direction of passage.
  • the metal particles and rolling emulsion residues can be moved by the cleaning liquid sprayed onto the rolling stock, in particular to an edge region closest to the respective spray location.
  • a further embodiment of the invention provides that a spray angle between the spray direction and a rolling stock surface of the rolling stock can be adjusted. This allows the spray direction of the respective cold rolling mill to be adjusted in order to optimize the cleaning effect depending on the facility.
  • a further embodiment of the invention provides that cleaning liquid is sprayed onto the upper side and the underside of the rolling stock.
  • This embodiment of the invention takes into account that, as a rule, both sides of a rolling stock are contaminated by metal particles and rolling emulsion residues during cold rolling, and cleaning both sides is therefore advantageous.
  • figure 1 shows schematically a section of a first exemplary embodiment of a tandem train 1 for cold-rolling a rolling stock 5 that is moved in a throughput direction 3 through the tandem train 1 and that is present as a rolled strip.
  • the tandem train 1 has several roll stands 7, 9, of which figure 1 only two are shown.
  • the two roll stands 7, 9 shown can be a first and a second roll stand 7, 9 or a second and a third roll stand 7, 9 of the tandem train 1.
  • Each roll stand 7, 9 has two work rolls 11 arranged one above the other, which are spaced apart from one another by a roll gap, through which the rolling stock 5 is guided and thereby rolled.
  • each roll stand 7 has a back-up roll 13 for each work roll 11 .
  • the tandem train 1 has an emulsion system 15 for dispensing a rolling emulsion 16 onto the work roll 11 and the rolling stock 5 .
  • the rolling emulsion 16 typically contains water, rolling oil and an emulsifier to make the rolling oil miscible with the water.
  • the rolling emulsion 16 can contain other components, for example at least one antioxidant, an anti-wear additive and/or an anti-corrosion additive.
  • the rolling emulsion 16 is discharged on the inlet side in the region of the roll gap of each roll stand 7, 9 onto the top and bottom of the rolling stock 5 and the two work rolls 11 of the roll stand 7, 9 and on the outlet side onto the two work rolls 11 of the roll stand 7, 9.
  • the entry side designates that side of a roll stand 7, 9 on which the rolling stock 5 is moved into the roll stand 7, 9, and the exit side designates the side of the roll stand 7, 9 opposite the entry side.
  • the emulsion system 15 has an emulsion tank 17 for storing rolling emulsion 16 and for each rolling stand 7, 9 a collection container 19 for collecting rolling emulsion 16 dripping from the rolling stand 7, 9. Furthermore, the emulsion system 15 has pipelines through which the rolling emulsion 16 is conducted from the collection containers 19 into the emulsion tank 17 and from the emulsion tank 17 to the rolling stands 7 .
  • Two spray bars 21, 23 for cleaning the rolling stock 5 are arranged between the first roll stand 7 and the second roll stand 9, with an upper spray bar 21 being arranged above the rolling stock 5 and a lower spray bar 23 being arranged below the rolling stock 5.
  • Each spray bar 21, 23 has a plurality of nozzles 25, through which a cleaning liquid 26 can be sprayed onto the rolling stock 5 in a spray direction which has a component opposite to the direction of passage 3.
  • the cleaning liquid 26 is in this Exemplary embodiment filtered rolling emulsion 16, which is supplied to the spray bars 21, 23 from the emulsion system 15 via a filter 27 and a pump 29, respectively.
  • the filters 27 filter out contaminants, in particular metal particles abraded from the rolling stock 5 and the work rolls 11, from the rolling emulsion 16.
  • a pressure of between 6 bar and 100 bar is generated with the pumps 29 in each case, with which the cleaning liquid 26 is sprayed onto the rolling stock 5 .
  • the vertical distance between the nozzles 25 and the rolling stock 5 is approximately 20 cm, for example.
  • Embodiments of spray bars 21, 23 are below based on the Figures 3 to 6 described in more detail.
  • Spray bars 21, 23 shown can also be arranged between further roll stands 7, 9 of the tandem train 1 spray bars 21, 23.
  • figure 2 shows schematically a section of a second exemplary embodiment of a tandem train 1 for cold-rolling a rolling stock 5 that is moved in a throughput direction 3 through the tandem train 1 and that is present as a rolled strip.
  • This embodiment differs from that in figure 1 shown embodiment only in that the spray bars 21, 23 are not fed from the emulsion system 15, but from a separate cleaning system 31, which supplies the spray bars 21, 23 with a cleaning liquid 26 that differs from the rolling emulsion 16 of the emulsion system 15.
  • the cleaning liquid 26 of this exemplary embodiment is, for example, an emulsion similar to the rolling emulsion 16 of the emulsion system 15, but the composition of which differs from the rolling emulsion 16 of the emulsion system 15 in order to improve the cleaning effect.
  • the cleaning liquid 26 is water, for example.
  • the cleaning system 31 has a cleaning tank 33 for storing cleaning liquid 26 , from which cleaning liquid 26 is supplied to the spray bars 21 , 23 in each case via a pump 29 and optionally via a filter 27 .
  • FIGs 3 and 4 show schematically a first embodiment of a spray bar 21 between two roll stands 7, 9. It shows figure 3 the spray bar 21, the rolling stock 5 and the roll stands 7, 9 in a plan view, and figure 4 shows the spray bar 21, the rolling stock 5 and the work rolls 11 of the roll stands 7, 9 in a side view, with FIG figure 4 for the sake of clarity, only one spray jet is shown.
  • the spray bar 21 extends above the rolling stock 5 between opposite edge regions 35, 37 of the rolling stock 5.
  • the spray bar 21 has two spray bar legs, which extend from the center of the spray bar 21 to one of the edge regions 35, 37 and form an angle with one another form, so that the spray bar 21 is V-shaped, with the tip of the V facing the rolling stand 7 through which the rolling stock 5 first passes.
  • the nozzles 25 of the spray bar 21 are arranged on an output side of the spray bar 21 which faces the roll stand 7 through which the rolling stock 5 passes first. Each nozzle 25 emits cleaning liquid 26 onto the rolling stock 5 in a spray direction which has a component opposite to the direction of passage 3 .
  • FIGs 5 and 6 show schematically a second embodiment of a spray bar 21 between two roll stands 7, 9. It shows figure 5 the spray bar 21, the rolling stock 5 and the roll stands 7, 9 in a plan view analogous to figure 3 , and figure 6 shows the spray bar 21, the rolling stock 5 and the work rolls 11 of the roll stands 7, 9 in a side view analogous to FIG figure 4 .
  • the spray bar 21 does not extend in a V-shape, but rather straight above the rolling stock 5 between opposite edge regions 35, 37 of the rolling stock 5.
  • the nozzles 25 of the spray bar 21 are arranged on an output side of the spray bar 21, which corresponds to that of the rolling stock 5 facing the roll stand 7 passed through first, and each nozzle 25 emits cleaning liquid 26 onto the rolling stock 5 in a spraying direction which has a component opposite to the direction of passage 3 .
  • each nozzle 25 has a component which is directed towards that edge region 35, 37 which is closest to the respective nozzle 25.
  • this is achieved by the V-shape of the spray bar 21, it being possible for the cleaning liquid 26 to be dispensed perpendicularly to a course of the respective spray bar leg.
  • it is achieved by the alignment of the nozzles 25 in the spray bar 21.
  • the spray bar 21 is pivotably mounted, so that a spray angle 39 between the spray direction and the surface of the rolling stock sprayed with the cleaning liquid 26 of the rolling stock 5 can be adjusted.
  • the nozzles 25 are, for example, flat jet nozzles, each of which has a jet profile that widens from the nozzle 25 to the rolling stock 5 .
  • the nozzles 25 can be embodied as solid jet nozzles which have a jet profile with an essentially constant cross section.
  • the cleaning of the rolling stock 5 according to the invention is inexpensive to purchase and easy to connect to an existing plant automation, since apart from an additional pump 29, optionally a filter 27 for filtering out impurities and a control valve per spray bar 21, 23 or spray bar group, no further trades are required for connecting the spray bars 21, 23 are necessary.
  • the spray bars 21, 23 spray the cleaning liquid 26 onto the rolling stock 5 under relatively high pressure, only a significantly smaller quantity of cleaning liquid 26, for example about 500 l/min per interstand area, is used as rolling emulsion 16 from the emulsion system 15 (for example 6000 l /min per roll stand 7, 9) is applied to the rolling stock 5, so that the cooling behavior of the rolling stock 5 is not significantly influenced by the additional spray bars 21, 23 and therefore a complex control of the cleaning liquid quantities emitted by the spray bars 21, 23 is superfluous (the Spray bars 21, 23 are simply switched on with a volume flow that is constant in terms of time and space).
  • the cleaning of the rolling stock 5 according to the invention is also suitable as a cost-effective retrofit solution for existing tandem mills 1.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Metal Rolling (AREA)
EP17178803.7A 2017-06-29 2017-06-29 Reinigen eines walzguts beim kaltwalzen des walzguts Active EP3421148B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP17178803.7A EP3421148B1 (de) 2017-06-29 2017-06-29 Reinigen eines walzguts beim kaltwalzen des walzguts
US16/619,284 US11554396B2 (en) 2017-06-29 2018-06-12 Cleaning rolling stock during cold rolling of the rolling stock
PCT/EP2018/065449 WO2019001945A1 (de) 2017-06-29 2018-06-12 Reinigen eines walzguts beim kaltwalzen des walzguts
CN201880043593.6A CN110809497A (zh) 2017-06-29 2018-06-12 在轧制坯料的冷轧期间清洁轧制坯料
JP2019572081A JP2020525297A (ja) 2017-06-29 2018-06-12 圧延ストックの冷間圧延中の圧延ストックの洗浄

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17178803.7A EP3421148B1 (de) 2017-06-29 2017-06-29 Reinigen eines walzguts beim kaltwalzen des walzguts

Publications (2)

Publication Number Publication Date
EP3421148A1 EP3421148A1 (de) 2019-01-02
EP3421148B1 true EP3421148B1 (de) 2022-10-05

Family

ID=59258114

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17178803.7A Active EP3421148B1 (de) 2017-06-29 2017-06-29 Reinigen eines walzguts beim kaltwalzen des walzguts

Country Status (5)

Country Link
US (1) US11554396B2 (ja)
EP (1) EP3421148B1 (ja)
JP (1) JP2020525297A (ja)
CN (1) CN110809497A (ja)
WO (1) WO2019001945A1 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116532478B (zh) * 2023-07-04 2023-10-20 中国重型机械研究院股份公司 一种不锈钢板轧制滚压装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3192752A (en) * 1963-06-27 1965-07-06 Aluminum Co Of America Cold rolling aluminum and product
JPS5841923B2 (ja) 1979-07-25 1983-09-16 日本パ−カライジング株式会社 鋼板の清浄処理方法
JPS56169781A (en) * 1980-05-31 1981-12-26 Sumitomo Metal Ind Ltd Production of cleaned steel sheet
JPH0215817A (ja) * 1988-07-01 1990-01-19 Nisshin Steel Co Ltd 冷間圧延における金属帯の洗浄方法
DD282632A5 (de) 1989-04-28 1990-09-19 Freiberg Bergakademie Vorrichtung zur bandreinigung beim walzen von kaltband
GB9316782D0 (en) * 1993-08-12 1993-09-29 Lamberton & Co Ltd Air wipe system
JPH10258301A (ja) 1997-03-14 1998-09-29 Kawasaki Steel Corp 光沢の優れた金属板の製造方法
CN101780485B (zh) * 2009-12-30 2012-09-05 一重集团大连设计研究院有限公司 一种乳化液清除装置
CN102671967B (zh) * 2012-05-04 2015-01-28 中冶南方工程技术有限公司 主动气流场控制式五机架冷轧连轧板面清洁装置
DE102012214298A1 (de) * 2012-08-10 2014-02-13 Sms Siemag Ag Verfahren zur Reinigung und/oder Entzunderung einer Bramme oder eines Vorbandes mittels eines Zunderwäschers und Zunderwäscher

Also Published As

Publication number Publication date
US20200139416A1 (en) 2020-05-07
WO2019001945A1 (de) 2019-01-03
CN110809497A (zh) 2020-02-18
EP3421148A1 (de) 2019-01-02
JP2020525297A (ja) 2020-08-27
US11554396B2 (en) 2023-01-17

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